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Spectral Evolution During Dipping of the Low Mass X-Ray Binary XBT 0748-676

Published online by Cambridge University Press:  25 May 2016

M. J. Church ,
M. Bałucińska-Church ,
K. Mitsuda ,
T. Dotani  and
K. Asai
M. J. Church
Affiliation:
University of Birmingham, Birmingham B15 2TT, UK
M. Bałucińska-Church
Affiliation:
University of Birmingham, Birmingham B15 2TT, UK
K. Mitsuda
Affiliation:
ISAS, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229, Japan
T. Dotani
Affiliation:
ISAS, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229, Japan
K. Asai
Affiliation:
ISAS, Yoshinodai 3-1-1, Sagamihara, Kanagawa 229, Japan

Extract

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XBT 0748-676 is a dipping LMXB source, with dips in X-ray intensity occurring at the orbital period of ~ 3.8 hrs. It is a member of the sub-group of dipping sources also including XB 1916-053 and XB 1254-690 in which the spectral evolution in dipping has previously been modelled by the “absorbed plus unabsorbed” approach, in which the dip spectra are modelled by two terms, each having the same form as used for non-dip emission, one of which is strongly absorbed but one which is not absorbed, which has a normalisation decreasing strongly in dipping. This energy-independent decrease has sometimes been taken to imply electron scattering in the absorber.

Type
Session 3: Diagnostics of High Gravity Objects with X- and Gamma Rays
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 372 - 373
Copyright
Copyright © Kluwer 1998 

References

Church, M. J. and Bałucinska-Church, M., 1995, A&A 300, 441 Google Scholar
Church, M. J., Dotani, T., Bałucinska-Church, M., Mitsuda, K., Takahashi, T., Inoue, H. and Yoshida, K., 1997a, ApJ 491, Dec. 10th.Google Scholar
Church, M. J., Bałucinska-Church, M., Dotani, T. and Asai, K., 1997b, ApJ Submitted Google Scholar